Henry t



H. T. WEAVER.

VARMBLE SPEED DRIVE- FHPLICATION FVILED JUNE 9, 1919- Patenmd Mar. 1, 1923 Ill/I 1 UNITED STATES.

PATENT OFFICE.

HENRY T. WEAVER, OF HEART LAKE, ALBERTA, CANADA.

VARIABLE-SPEED DRIVE. Y

Specification of Letters Patent.

Patented Mar. 1, 1921.

Application filed June 19, 1919. Serial No. 305,243.

I '0 all 10. mm it may concern.

Be it known that 1, HENRY T. WEAVER, a 'Jjecr of the King of Great Britain, residvi: tleart Lake, in the Province of Alon ta and Dominion of Canada, have invented no and useful Improvements in Variabit rill ryin beveled pinions. the one meshing with the gear on the shaft carrying the fanning healers and the remainder meshing alternately with the two gears which are mounted in wmmon, so that either one of the last said pinions may be employed in the transmission of motion from the first said gear to the gear carried on the shaft of the fanhing blades.

The invention is illustrated and described in a 3 rticular embodiment and is shown as a drivizrg mechanism for a fanning mill. taking '1'! a place of the usual chain employed for this purpose. It is obvious, however, that. by a variable speed driving mechanism, it may be employed for other purposes than that in which it shown and for this re son the right is reserved to inake any changes or alterations required to adapt it for particular purposes, in so far as such changes or alterations are compatible in spirit with the annexed claim.

In the accompanying drawings:

Figure 1 is a view in side elevation of a fanning mill frame with the improved variable speed drive attached or mounted thereon.

Fig. 2 is an end elevational view of the structure shown in Fig. 1.

Fig. 3 is a section on the line 33 of Fig. 1

As illustrated, the invention is employed as a means for driving a fanning mill having the usual frame 1 which supports the shaft 2 in the usual manner, this shaft carrying and driving when it is turned the fanning blades On one end of the shaft 2 and on the outside of the frame 1 there is mounted a beveled gear 4 in mesh wlth which there is a beveled pinion 5, the latter being carried by the lower end of a diagonally disposed sectional shaft rotatably mounted in appropriate bearings 6 which are supported on the diagonally disposed struts or braces 7. The two-part shaft consists of a tubular section 8 and a solid section 9, the latter telescoping into the former and being locked therein by means of set screws 10 which threadingly engage the tubular section and bear upon the solid section 9. The solid section 9 telescopes the tubular section for a greater part of the length of thelatter and this construction obviously permits the elongation of the sectional shaft or the shortening thereof for a purpose hereinafter appearing.

Botatably supported in. appropriate bearings carried by the frame 1 there is a main shaft 11 on which there is carried a double gear element consis'ing of the gear 12 and the gear 13, the latter being larger than the former and in surrounding relation to it, the two gears rotating about the axis of the shaft 11 as a common center. There is provided for meshing with the gear section 13 a beveled pinion 14 which is carried by the section 9 of the two-part shaft. This pinion is formed with a spline in which a key 15 carried by the shaft 9 engages. On the extremity of the section 9 a beveled pinion 16 is carried, this pinion being fixedly attached to the section 9 and movable into a position where it will mesh with the teeth of the gear section 12 or into a position where it will stand between this gear section and the gear section 13.

The elongation of the two-part shaft is effected by loosening the set screws 10 after which the section 9 of the two-part shaft may be raised, this lengthening of the shaft throwing the pinion 16 into mesh with the gear section 12. The pinion 14 being slidably mounted on the section 9, this section will slide through it until the key 15 stands in the same position with respect to the gear section 12 that the pinion 16 previously occupied. The key then will have been disengaged from the pinion 14 with the result that the latter will fioatvon the section 9 tion 12 because of its meshing with the pinion 16 and the latter turning the two-part shaft whose rotary motion is communicated to the shaft 2 through the gear couple composed of the pinion 5 and gear 4.

The shaft 11 on which the double beveled gear is carried is rotated and with it the double beveled gear by means of a crank 17 which is connected with a double beveled gear, the latter being fixedly attached to the shaft 11. Assuming the angular movement of the crank 17 to always be moved at a uniform angular speed, the speed of the shaft 2 and with it the fanning blades 3 will be less with the pinion 16 meshing with the gear section 12 than with this pinion thrown out of mesh with its attendant gear section and the pinion 14s positively connected with the two-part shaft, as it will be when the shaft is shortened by loosening the set screws i0 and moving the section 9 farther into the tubular section 8, when the pinion 16 will be withdrawn from engagement with the gear section 12 and the key 15 made to engage in the key spline formed in the pinion 14. The turning of the crank 17 at the same angle of velocity as before will then result in an angular velocity being had by the tanning blades 3.

From the foregoing description and the accompanying drawings, it is believed that aclear enough understanding of the invention is to be had to render further description unnecessary.

The invention having been described what claimed as new and useful is:

The combination of a driven member, a driving member, a dual beveled gear carried by the driving member and formed with one of its gear elements in surrounding relation to the other but roncentric therewith and having its teeth spaced from the teeth of the other said beveled gear, a two-part extensible shaft having one section operatively connected with the d 'iven member, a key carried in the other section of said shaft, a beveled pinion meshing with the larger of the gears of the dual beveled gear and hav ing a spline in which said key may engage, and a beveled pinion positively connected to the extremity of the said other section of the extensible shaft, means whereby the iatter may be varied in length to throw the last named beveled pinion into or out of operative connection with the snialier of the gears of the dual gear and engage or disenthe said key with the said spline so that the speed of the driven member may be varied with. constant speed of the driving member.

.ln testimony whereof l aiiiix my signature.

HENRY T. WEAVER. 

